The Periodic Table of Elements
18
Ar
Argon
39.948(1) amu
Additional Information:
| State | Group Block | Density | Atomic Radius | Electron Affinity | Ionization Energy | Melting Point | Boiling Point | Year Discovered |
|---|---|---|---|---|---|---|---|---|
| gas | noble gas | 0.001784 kg/L | 97 pm | 0 | 1521 kJ/mol | 84 °K | 87 °K | 1894 |
